A method for producing ethyl benzene by catalysis, distillation and alkylation

A catalytic distillation and catalytic distillation tower technology, applied in the field of catalytic distillation to produce ethylbenzene, can solve the problems of lower ethylene partial pressure, low reaction speed, high ethylene conversion rate, etc.

Inactive Publication Date: 2009-03-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the above invention, since the catalytic distillation tower or the tubular reactor operates under the condition of gas-liquid phase equilibrium, ethylene is enriched in the gas phase, and the ethylene concentration in the liquid phase is very low, and with the progress of the alkylation reaction between benzene and ethylene , the released reaction heat makes a large amount of benzene enter the gas phase from the liquid phase, which further reduces the partial pressure of ethylene in the gas phase, and the ethylene concentration in the liquid phase further decreases accordingly, while the alkylation reaction is carried out in the liquid phase, so the reaction speed is faster Low, difficult to achieve high ethylene conversion rate

Method used

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  • A method for producing ethyl benzene by catalysis, distillation and alkylation

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1 catalytic distillation reaction process

[0019] The schematic diagram of the catalytic distillation tower is attached figure 1 . The total height of the catalytic distillation tower is 3.5m, including the top condenser, the reaction section, the stripping section and the reboiler of the tower kettle, and there is no rectification section. The inner diameter of the reaction section and the stripping section is 25mm, and the effective height of the reaction section is 1.5m. The height is 0.5 meters, filled with Φ4×4mm stainless steel rolling rings. The total reflux operation is adopted. The condensate at the top of the tower is measured by the reflux controller equipped with a metering tube and then all refluxed into the tower. The reaction tail gas is measured and vented from the top of the tower through the back pressure valve, and its composition is analyzed to calculate the ethylene conversion rate. , The tower kettle uses a metering pump to control t...

Embodiment 2

[0021] Example 2 Using zeolite beta as catalyst

[0022] 100 grams of beta zeolite raw powder (SiO 2 / Al 2 o 3 27, 600 DEG C roasting 3 hours weight loss 17%) and 47 grams of SB powder (a kind of pseudo-boehmite imported from Germany, 600 DEG C roasting 3 hours weight loss 25%), the right amount of turmeric powder mix evenly, add right amount of nitric acid and Deionized water, extruded into strips, made into strips with a diameter of 1.6 mm, dried overnight at 120°C, and roasted in a muffle furnace at 540°C for 3 hours, and then heated with 0.8M NH 4 NO 3 The aqueous solution was exchanged 3 times at 90°C, washed 3 times with deionized water, dried at 120°C for 4 hours, calcined at 530°C for 2 hours, and finally treated with water vapor at 350°C for 2 hours, and broken into catalysts with a length of 4-6 mm.

[0023] After activating 100 grams of the above-mentioned catalyst at 550° C. for 1 hour in a high-purity nitrogen flow, under the protection of high-purity nitrogen...

Embodiment 3

[0024] Example 3 Using Y zeolite as catalyst

[0025] 100 grams of HY zeolite raw powder (SiO 2 / Al 2 o 310, 600 °C roasting for 3 hours to lose weight 19%) with 24 grams of SB powder (a kind of pseudo-boehmite imported from Germany, 600 °C roasting for 3 hours to lose weight 25%), mix evenly with appropriate amount of turmeric powder, add appropriate amount of nitric acid and deionized Water, extruded on the extruder to form a strip-shaped catalyst with a diameter of 1.6 mm. After drying overnight at 120°C, roast it in a muffle furnace at 500°C for 2 hours, and treat it with water vapor at 400°C for 2 hours. Break it into 4-6 mm long catalyst.

[0026] After activating 70 grams of the above-mentioned catalyst at 550° C. in a high-purity nitrogen stream for 1 hour, under the protection of high-purity nitrogen, mix it with 610 milliliters of Φ4×4mm stainless steel calendered rings and then put it into the reaction section of the catalytic distillation tower according to Exam...

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Abstract

The preparation method for ethylbenzene selects high-pure ethene or refinery dry gas as material for alkylation reaction in catalytic distillation tower. Wherein, the tower comprises a reboiler, a stripping section, a reaction section with one or more condensers to take up some heat and condense part benzene vapour to improve ethene conversion, and a condenser on tower top.

Description

technical field [0001] The invention relates to a method for producing ethylbenzene by catalytic distillation, specifically, a condenser is arranged in the reaction section of a catalytic distillation tower for producing ethylbenzene by catalytic distillation of benzene and ethylene to increase the conversion rate of ethylene. Background technique [0002] USP 4849569 discloses a method to make benzene and C 2 -C 12 Alkylation reaction of olefins to produce alkylbenzenes, using molecular sieves or acidic ion exchange resins as catalysts, has the advantages that the catalyst is not easily deactivated, does not require periodic regeneration, the reaction heat is fully utilized, and the ratio of feed benzene to olefin can be reduced to close to 1 Etc. [0003] USP 5476978 discloses a process for producing ethylbenzene by catalytic distillation. Fresh benzene enters the catalytic distillation tower together with reflux benzene so that the benzene in the catalytic distillation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/073C07C2/66
CPCY02P20/10Y02P20/52
Inventor 王清遐孙新德徐龙伢刘盛林
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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